Jump Ring Calculator
Calculate jump ring dimensions and aspect ratios from mandrel size and wire gauge. See which chainmaille weaves your rings will work with.
The outer diameter of your mandrel or dowel.
Auto-fills wire diameter below.
Or enter directly to override gauge.
Inner Diameter
4.00mm
Outer Diameter
6.05mm
Aspect Ratio
3.91AR
Rings per Inch of Mandrel
24.8rings/in
Wire per Ring
15.78mm
Aspect Ratio Reference
Highlighted row matches your current AR (3.91).
| AR Range | Compatible Weaves |
|---|---|
| 2.5 – 3 | 1-in-1 chain |
| 3 – 3.5 | Byzantine, Box chain |
| 3.5 – 4 | Full Persian, Jens Pind |
| 4 – 5 | European 4-in-1, Dragonscale |
| 5+ | Japanese patterns, Loose weaves |
Tips
- Rings spring back slightly after cutting — actual ID may be 0.1-0.2mm larger than mandrel size.
- For consistent rings, wind your coil tightly and use a jeweler's saw (not flush cutters) for clean ends.
- Aspect ratio is the most important number for chainmaille — it determines which weaves will work.